Cone-rod dystrophy (CORD) typically leads to an early onset impairment of vision. Initially, loss of color vision and visual acuity is observed, which is then followed by night blindness and loss of peripheral vision. In extreme cases, these progressive symptoms are accompanied with progressive retinal pigmentation and chorioretinal atrophy of the central and peripheral retina. In the majority of families, atrophy of the central and peripheral retina is not found.